Anatomy of Flowering Plants MCQs

Read the following statements regarding the epidermal tissue system and identify the correct combination of statements:

I. The epidermis is usually single-layered and made of elongated, compactly arranged parenchymatous cells.
II. Epidermal cells have a large amount of cytoplasm lining the cell wall and a small central vacuole.
III. The outside of the epidermis is covered with a waxy thick layer called cuticle in all vegetative plant organs.
IV. Cuticle prevents the loss of water and is completely absent in roots.

Analyze the following statements about epidermal appendages and choose the correct option:

I. Root hairs are multicellular elongations of epidermal cells that help absorb water and minerals from soil.
II. On the stem the epidermal hairs are called trichomes.
III. Trichomes in the shoot system are usually multicellular and can be branched or unbranched.
IV. Trichomes help in preventing water loss due to transpiration and may even be secretory.

Which of the following combinations of statements accurately describes guard cells in different plant groups?

I. In grasses, the guard cells are characteristically dumb-bell shaped.
II. In dicotyledonous plants, guard cells are typically bean-shaped.
III. The outer walls of guard cells facing the stomatal pore are highly thickened, while the inner walls are thin.
IV. Guard cells possess chloroplasts and play a key role in regulating stomatal opening and closing.

Read the statements about the stomatal apparatus and select the correct combination:

I. A few epidermal cells in the vicinity of guard cells can become specialized in shape/size to form subsidiary cells.
II. The stomatal aperture and guard cells alone constitute the stomatal apparatus.
III. Subsidiary cells do not contain chloroplasts and are identical to general epidermal cells.
IV. The stomatal aperture, guard cells, and surrounding subsidiary cells together form the stomatal apparatus.

Identify the correct set of statements regarding the ground tissue system in plants:

I. All tissues except epidermis and vascular bundles constitute the ground tissue.
II. The ground tissue system consists of simple tissues such as parenchyma, collenchyma, and sclerenchyma.
III. In primary stems and roots, parenchymatous cells are usually present in cortex, pericycle, pith, and medullary rays.
IV. In leaves, the ground tissue consists of thin-walled chloroplast containing cells and is called mesophyll.

Read the following statements about the cortex of a young dicot stem and select the correct option:

I. The outer hypodermis consists of a few layers of collenchymatous cells that provide mechanical strength.
II. Cortical layers below hypodermis consist of rounded, thick-walled sclerenchymatous cells.
III. The innermost layer of the cortex is the endodermis, whose cells are rich in starch grains.
IV. The endodermis of a young dicot stem is also referred to as the starch sheath.

Choose the correct statements regarding the pericycle of a dicotyledonous stem:

I. The pericycle lies on the outer side of the endodermis.
II. It is present in the form of semi-lunar patches of sclerenchyma.
III. These sclerenchymatous patches are situated directly above the phloem.
IV. The pericycle of a dicot stem is a continuous, single-layered ring of thick-walled parenchyma.

Analyze the following statements and choose the correct combination:

I. In between vascular bundles, there are a few layers of radially placed parenchymatous cells constituting medullary rays.
II. Medullary rays in dicot stems are composed of highly lignified, dead sclerenchymatous fibers.
III. A large number of vascular bundles arranged in a ring is a diagnostic characteristic of dicotyledonous stems.
IV. The ring arrangement of vascular bundles is also found in monocotyledonous stems.

Identify the correct set of statements regarding the vascular bundles of a young dicot stem:

I. Each vascular bundle is conjoint and open.
II. The vascular bundles possess an endarch protoxylem arrangement.
III. The cambium is present between the phloem and xylem.
IV. The phloem is located on both the inner and outer sides of the xylem.

Read the following statements about the pith of a dicot stem and select the correct combination:

I. The pith occupies the peripheral region of the stem cortex.
II. It consists of a large number of rounded, parenchymatous cells.
III. The cells of the pith have large intercellular spaces.
IV. The pith is extremely small or inconspicuous in dicot stems.